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negotiation-c3rep40-20261027-b03-p02-hh-a1

HH; buyer opens; AGREEMENT

buyer owner instruction

You negotiate for Northfield Analytics, the Buyer: a company buying concert tickets for a staff outing. This brief is private: the other side cannot see it.

Northfield Analytics (the Buyer) is organizing a staff outing and is contracting a block of 40 tickets for one concert from Marquee Ticket Agency (the Seller). The two sides negotiate the contract terms in alternating turns. Each side represents its own organization.

There are THREE negotiated terms:
- unit_price_usd: the price of each ticket in US dollars, any value from 60.00 to 100.00 (two decimal places at most).
- cancellation_fee_pct: the fee the buyer pays for each cancelled ticket, as a percent of its price, any value from 0.00 to 100.00.
- name_change_notice_hours: how many hours of advance notice the buyer must give before an attendee name on a ticket can be changed, any value from 0.00 to 96.00 (a higher number means earlier notice is required).

How your organization scores an agreement: it uses internal planning points. They are a planning score only, not dollars, money or a real transaction. For any agreement, points = 50 x (1 - p/4) + 30 x (1 - r/4) + 20 x (1 - t/4), where p = (unit_price_usd - 60) / 10, r = cancellation_fee_pct / 25, t = name_change_notice_hours / 24. Higher points are better for your organization. If there is no agreement, your organization gets 20 points.

Rules:
- There are at most 12 turns, alternating between the two sides.
- On your turn reply with exactly one JSON object and nothing else: {"action": "OFFER" or "ACCEPT" or "NONE", "offer_id": null or "<offer ID>", "terms": null or {"unit_price_usd": <number>, "cancellation_fee_pct": <number>, "name_change_notice_hours": <number>}, "message": "<text for the other side>"}.
- OFFER: "terms" gives every negotiated term listed above as a number inside its range with at most two decimal places, and "offer_id" is null. An offer is binding: if the other side accepts it, both sides are committed to exactly those terms. A new offer replaces any earlier standing offer.
- ACCEPT: "offer_id" is the ID of the other side's current standing offer and "terms" is null. This creates a binding agreement on exactly that offer. You cannot accept your own offer.
- NONE: no offer and no acceptance this turn; "offer_id" and "terms" are null.
- Words in "message" never make, change or accept a deal; only the action does. "message" is at most 80 words and is shown to the other side.
- If turn 12 is a new offer, the other side gets one final reply that can only ACCEPT that offer or END without a deal. Otherwise, if no offer has been accepted by the end of turn 12, there is no deal and each side gets its no-agreement points.

seller owner instruction

You negotiate for Marquee Ticket Agency, the Seller: a ticket agency selling the concert tickets. This brief is private: the other side cannot see it.

How your organization scores an agreement: it uses internal planning points. They are a planning score only, not dollars, money or a real transaction. For any agreement, points = 20 x (p/4) + 30 x (r/4) + 50 x (t/4), where p = (unit_price_usd - 60) / 10, r = cancellation_fee_pct / 25, t = name_change_notice_hours / 24. Higher points are better for your organization. If there is no agreement, your organization gets 20 points.

Turn 1 · buyer

negotiation-c3rep40-20261027-b03-p02-hh-a1-k01

Northfield Analytics proposes a block of 40 tickets at $62.00 each, a 5% cancellation fee per cancelled ticket, and 12 hours' notice for name changes. We are open to discussing a fair balance on all three terms.

{
  "action": "OFFER",
  "offer_id": null,
  "terms": {
    "unit_price_usd": 62,
    "cancellation_fee_pct": 5,
    "name_change_notice_hours": 12
  }
}

Turn 2 · seller

negotiation-c3rep40-20261027-b03-p02-hh-a1-k02

Marquee thanks Northfield for the proposal. A 40-ticket block for a concert in demand needs firmer terms than $62 with a 5% fee and 12 hours' notice. We propose $85.00 per ticket, a 40% cancellation fee, and 48 hours' notice for name changes. We're open to discussing the balance between these terms.

{
  "action": "OFFER",
  "offer_id": null,
  "terms": {
    "unit_price_usd": 85,
    "cancellation_fee_pct": 40,
    "name_change_notice_hours": 48
  }
}

Turn 3 · buyer

negotiation-c3rep40-20261027-b03-p02-hh-a1-k03

Northfield appreciates Marquee's counter, but $85 per ticket with a 40% fee and 48 hours' notice is above our budget. We propose $72.00 per ticket, a 20% cancellation fee, and 24 hours' notice for name changes. This keeps a firm block commitment while staying within what we can approve for a 40-person outing.

{
  "action": "OFFER",
  "offer_id": null,
  "terms": {
    "unit_price_usd": 72,
    "cancellation_fee_pct": 20,
    "name_change_notice_hours": 24
  }
}

Turn 4 · seller

negotiation-c3rep40-20261027-b03-p02-hh-a1-k04

Marquee appreciates Northfield's movement from $62. Our concert block is in high demand and we must hold inventory for 40 seats. We can meet you partway: $78.00 per ticket, a 30% cancellation fee, and 36 hours' notice for name changes. We're open to discussing the balance further.

{
  "action": "OFFER",
  "offer_id": null,
  "terms": {
    "unit_price_usd": 78,
    "cancellation_fee_pct": 30,
    "name_change_notice_hours": 36
  }
}

Turn 5 · buyer

negotiation-c3rep40-20261027-b03-p02-hh-a1-k05

Northfield is committed to a firm 40-ticket block and values Marquee's inventory hold. We can move to $74.00 per ticket, keeping the 20% cancellation fee and 24 hours' name-change notice from our last proposal. This is near our approval ceiling, so we ask Marquee to meet us here.

{
  "action": "OFFER",
  "offer_id": null,
  "terms": {
    "unit_price_usd": 74,
    "cancellation_fee_pct": 20,
    "name_change_notice_hours": 24
  }
}

Turn 6 · seller

negotiation-c3rep40-20261027-b03-p02-hh-a1-k06

Marquee values Northfield's firm 40-seat commitment and will hold inventory. We can move to $75.00 per ticket, keep the 20% cancellation fee, and require 30 hours' notice for name changes, a modest step from our last position. This is our best movement on the price for a block this size.

{
  "action": "OFFER",
  "offer_id": null,
  "terms": {
    "unit_price_usd": 75,
    "cancellation_fee_pct": 20,
    "name_change_notice_hours": 30
  }
}

Turn 7 · buyer

negotiation-c3rep40-20261027-b03-p02-hh-a1-k07

Northfield accepts Marquee's offer O6: $75.00 per ticket, a 20% cancellation fee, and 30 hours' notice for name changes, for a firm block of 40 tickets. We appreciate Marquee holding inventory for us.

{
  "action": "ACCEPT",
  "offer_id": "O6",
  "terms": null
}

Recorded outcome

{
  "unit_id": "negotiation-c3rep40-20261027-b03-p02-hh-a1",
  "block": 3,
  "position": 2,
  "phase": "main",
  "condition": "C3",
  "pairing": "HH",
  "assignment": 1,
  "cell": "C3|HH|a1",
  "models_by_role": {
    "buyer": "claude-haiku-5-5",
    "seller": "claude-haiku-5-5"
  },
  "agent_of_role": {
    "buyer": "A",
    "seller": "B"
  },
  "first_speaker": "buyer",
  "calls_attempted": 7,
  "repairs_used": 0,
  "invalid_attempts": [],
  "bounds": {
    "buyer_gain": [
      -20,
      80
    ],
    "seller_gain": [
      -20,
      80
    ],
    "joint_gain": [
      0,
      90
    ]
  },
  "status": "AGREEMENT",
  "known": true,
  "reason": "agreement",
  "agreement": true,
  "no_deal": false,
  "deal": {
    "terms": {
      "unit_price_usd": "75.00",
      "cancellation_fee_pct": "20.00",
      "name_change_notice_hours": "30.00"
    },
    "offer_id": "O6",
    "proposer": "seller",
    "acceptor": "buyer"
  },
  "utilities": {
    "buyer": {
      "exact": "69",
      "value": 69
    },
    "seller": {
      "exact": "233/8",
      "value": 29.125
    }
  },
  "gains": {
    "buyer": {
      "exact": "49",
      "value": 49
    },
    "seller": {
      "exact": "73/8",
      "value": 9.125
    }
  },
  "joint": {
    "exact": "785/8",
    "value": 98.125
  },
  "joint_gain": {
    "exact": "465/8",
    "value": 58.125
  },
  "efficiency": {
    "exact": "31/48",
    "value": 0.6458333333333334
  },
  "efficiency_all_assigned": {
    "exact": "31/48",
    "value": 0.6458333333333334
  },
  "buyer_share_of_joint_gain": {
    "exact": "392/465",
    "value": 0.843010752688172
  },
  "below_fallback": [],
  "technical_pass": true
}